Fuel feeding system



M y 1932- F. R. HUNTER FUEL FEEDING SYSTEM Filed April 7/192 2 Sheets-Sheet 1 v INVENTOR.

Frank H- Hunier y 1, 1932. F. R. HUNTER FUEL FEEDING SYSTEM Filed April 7, 1927 Z'Sheets-Sheet 2 Y I INVENTOR. Frank R- HUME? TORNE Y.

Patented; May i 31,, 1932 I inventien neietes tesfuei feeding. s yse temsgnand panticnimrlyi that typev of systen'a nin othemohj'ct of?the' insta ntinventien is 130;; aziiovel *d'ev iees for introducing th desired qiiantityo f aifite th' rAn even objeem ranght, v

new the air mixing: chaim== jeets a (1 rspeei ficidem heeafiree of the damned d iewmgs'g wheriir one enilj ofliinent of the invention is illngtrated, and whe'r 11:; P

Figin es "1 3113*2, make tip 'a v01311111) dist-- gramni st zaicatl --g5ievv on 3- file} feedingsys'tefii; .eimadeineieebi'iialflce" witii' this invention, the views for the {most part beingvertical oentra1sections.- e Fig. 3 is va perspective view of one embodiment of the expansion chamber which 1 from mill 10 to the v ilfi 'is interposed in thecsupply pipe line.

Fig. 4 Lean enlarged vertical cros s-section of the supply'pipe taken on line IV- IV. of Fig. 2, looking in the direction of the arrow,

and showing the end of the air mixing cham- 91'. e

" motion of" the pulverized a Figu 51* a? vertieek l engitndinnle s ectionge thru the 5 combined seminary 'afir "medmage.

chamber; aniik nezzleyatstken'emline V V Fig; 4, min

chmmbernezziep r t I. 'Sirniiarrefefiencechsra ete ns refei fd fikw parts'thr-uoutthe severail view's-g a "d filiienue meral designates amordi my 11613 15161, inte which is dumped are 00331 tofli pulverized end useek in a fu feedin yevem ef fihie type; Eheheppen 'Zgemptixasinto a fierimii telly: disposed- .pipe 8, which hedges-"a; r

em: becentee he eniiagqe;

is anew; V

ate'higieteiipeiettie a euntenfiiineg it,iei

F'gz e is new me: View; at? thenmi'xni'g5 us Tm. I

of 'ptvefeii f ielfi itt nten e enera e? I I the heavier parts of the pulverized fuel. To

16, which will permit of adjusting the I amount of the fresh air which enters the same. One form ofconstructin a means for admitting the supplyof 'airis s own here to bah upperfand a lower aperture 19 and 20 respectively,

' a slidably mounted cover 21, which may be v series [of openings 26 formed therethru and adjusted to overn the sizeof the two aper; l5

tures'. The ower aperture 20also serves as a ,clean outdoorv for removing accumulations of poarse coal particles. jWhe'nlthe pulverized'fuelgentersxthe expansion, chamber 16,

theheavier particles drop to the bottom;-the

lighten. dust intermingles with, the fresh air, and passes out the larger pipe 18a to the air mifxingj chamber' and nozzle 22 and 23 respectively,,which is here shown to be a single castm housingv the exit end of pipe 18.,;A,plura ityofspirally arranged ribs 24 arefOrmed'omthe-inner surface of pipe 18a immediately adjacent the exit end thereof,

which is housed inrthe air. mixing chamber 22, as shown in Figs. 2 and 5. The air mixing chamber .22, is frusto-conical, and :ex-

tends back fromlthe exit end of pipe 18a where ,iti'sclosed by-arplate 25, having a aroundypipe l8a.'j Plate 25 rotatably supports a'disci27 having openings 28-therein, whichregister with I openings 26, when the draught tothe air mixing chamber22 en-.

tirely open; Obviously, disc 27 1 may be rotated' to; partially close openings 26, and 40 therebyprovide an'adjustable means for allowinga predetermined amount of air to entermixing chamber 22.; It is to'be noticed that the air entering chamber 22 through V the openings is not under pressure, but is in itheformjofga draught being pulledinto the ing ll mbiyand towardthe stream of the whirling force of air and suse pend pulverized fuel as'it passes from the exit end of .pipe'18a, ribs 24 having. set up a ingthe expansion chamber 22, produces an exceptional fire.

the whirling motion. As the pulverized fuel andprimary air enter the air mixing chamher, the proper combustible mixture is formed,;and the same passes thru the'fee'd nozzle23, having its major axis disposed in a horizontal plane. It has been found that the properadjustment of the fresh airenter:

, i Combustion is practically perfect, and the efiiciencgiof the fuel. feeding system. is extremely hig s i notnecessary to positionthe pulverizedfuel conveying-pipes in any par- Sinceit s ticularfirelation with respect'to the pulverizing mill; andfeeding nozzle, and the various novel .partsrof. the fuel. feeding system: may

In a fuel feeding system the combination with a fuel pulverizing chamber and means for introducingfuel and fluessgases thereinto, of means for'conveying, suspended fuel from said chamber comprising a conduit, each of which is provided with an'expansion chamber therein having'inl'ets for introducing an air supply into said expansion chamber,.afan for drawing the fuel and air mixture from said expansion chamber, and'an air, mixing chamber andxcombustion nozzle. connected to. the fan to receive the dischargetherefroms .f a 2. An apparatus for preparing and feeding fuel, comprising -a pulverizin' ,chamber, means for feedinga mix'ture'of ueland flue gas to said pulverizing chamber 'a fan for exhausting a mixture of pulverized manna; fiue'gas from said pulverizin chamber,a conduit connecting said fan an said pulveriz'in chamber, an expansion chamber in said con uit positioned intermediate said fan and said pulverizing chamber provided with inn, lets to admit air into said expansion chamberto mingle with theleaving mixtureof pulverized fuel and flue gas, andan air; mixing chamber connected to said fan to receive the discharge therefrom; f 3. An, apparatus for preparing and feeding fuel comprising a pulverizing chamber, a conduit extending through saidchamber having inlettand outlet aperture'sand a par-f tition inthe conduit intermediate the aper- ,tures, means for feedin fueland flue, gas

into the conduit towar stheinlet thereof, an expansion chamber connectedto said con- ;duit {external of said,,pulverizing' chamber provided with inlets to admit air to said ex-, pansion chamber, a fan for exhausting a mixture'of pulverized fuel, flue gas andair from said expansion? chamber, and i conduit means connecting said 'fanand said expansion chamher, said last named conduit means having a bore larg r than saidfirst conduit means and being. positioned in alined longitudinal relation therewith. Y

In testimony wh 'reof l hereunto signature.

i WFRANKQR-[HUNTER I no, 

